The Kepler Mission performed a statistical survey of target stars in the Kepler Field of View (FOV) to identify and characterize transiting planets and to determine their occurrence rates. Emphasis was placed on detecting Earth-size planets orbiting in the Habitable Zone (HZ) of Sun-like stars [1]}, [2]}. The details of Kepler science operations and data acquisition were reported by [3]}. The spacecraft was launched on 6 March 2009 into a heliocentric Earth-trailing orbit with a period of 373 days. Primary mission science data were acquired for four years (12 May 2009 – 12 May 2013) before the failure of a second (of four) reaction wheel precluded the precise photometer pointing required to support the detection of small transiting planets in the Kepler FOV. The 3.5-year baseline mission had been completed by this point, and Kepler was six months into a mission extension. Primary mission data were collected in 93-day observing quarters bounded by 90\(\)  rolls of the photometer about its boresight to allow the solar panels to continue to be illuminated by the Sun. A repurposed mission named K2 [4]}, [5]} was subsequently proposed and implemented to acquire science data with reduced target sets and degraded photometric precision (with respect to the primary Kepler Mission) in fields of view centered on the plane of the ecliptic.
